Oxygen scavenging films

Abstract

The invention discloses oxygen scavenging films having at least one oxygen scavenging layer comprising a blend of ethylene / methyl acrylate / cyclohexene methyl acrylate copolymer (EMCM) as oxygen scavenger resin and a catalyst in a carrier resin, and an outer substrate layer having a thickness greater than 5% with respect to the total thickness of the film. The invention also relates to a process for the manufacturing of such films, to the use of said films in food packaging and to the packages obtained therefrom.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority from U.S. Non-Provisional Application Ser. No. 62 / 167,926 filed May 29, 2015, which the application is hereby expressly incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates to multilayer oxygen scavenging films, to their use in packaging operations and to the packages obtained therefrom. The invention also relates to a process for the manufacturing of such oxygen scavenging films.BACKGROUND OF THE INVENTION[0003]It is known that many oxygen sensitive products, including food products such as dried milk, meat and cheese, smoked and processed luncheon meats as well as non-food products such as electronic components, pharmaceuticals, and medical products, deteriorate over time in the presence of oxygen, in part because of dissolved oxygen typically present in the packaged material at the time it is placed in the packaging container and also in part due to oxygen ingress wh...

AI Technical Summary

Benefits of technology

[0033]As used herein the words “bulk layer” refer to a film layer having the primary purpose of provide extrusion stability and abuse resistance.

[0055]“Photoinitiator” means a substance which, when activated by actinic radiation, enhances and / or facilitates the initiation of one or more properties (e.g., oxygen scavenging) in another compound, thus resulting in a shorter induction time and / or an increase in the rate of oxygen uptake of the overall system.

[0056]“Antioxidant” means a material which can inhibit oxidative degradation and / or crosslinking of a polymer so as to, for example, prolong the useful lifetime of the polymer, to stabilize a polymer-containing composition during processing (e.g., extrusion, coating, lamination, etc.); and / or to prolong the shelf-life of the composition (prior to exposure thereof to actinic or e-beam radiation).

Problems solved by technology

It is known that many oxygen sensitive products, including food products such as dried milk, meat and cheese, smoked and processed luncheon meats as well as non-food products such as electronic components, pharmaceuticals, and medical products, deteriorate over time in the presence of oxygen, in part because of dissolved oxygen typically present in the packaged material at the time it is placed in the packaging container and also in part due to oxygen ingress which occurs during storage.

Both the color and the flavor of foods can be adversely affected.

The oxidation of lipids within the food product can result in the development of rancidity.

Oxidative rancidity of fats such as lard, shortenings, salad and cooking oils refers to the undesirable odours and flavors which develop when such products are exposed to the oxygen in the air.

Products containing these fats, including but not limited to food products such as dried milk, meat and cheese, smoked and processed luncheon meats can become rancid as the fats in the products react to air.

Rancidity in foods may range from very slight, resulting in loss of freshness, to very severe, resulting in objectionable odours and / or flavors.

A slight degree of rancidity may not be objectionable to consumers, but products which do not seem fresh will not attract repeat purchases.

If customers do not return to a product, the long-term effects of a slight degree of rancidity can be very serious.

At the same time, there is increasing pressure in the marketplace to use, especially in certain foods, more highly unsaturated alternatives which are healthier, but unfortunately have the disadvantage of being more oxygen sensitive.

Such packaging devices have the disadvantages of requiring additional packaging operations, potential breakage of the sachet causing contamination of the packaged goods, and uneven or localized scavenging.

Unfortunately many of the resultant volatile compounds are not maintained within the film structure and find their way into the headspace of the package.

Here they have the potential to degrade the taste, color and / or odour of comestible products.

As a result, the film may not provide the desired level of oxygen barrier properties.

Furthermore, these films still have the potential to create organoleptic issues due to the production of volatile compounds as byproducts of the oxidation of the oxygen scavenging component.